Type = Missing is the preferred option with missing data because it leads to using all available data. In contrast, if you don't say Type = Missing you get listwise deletion (note the sample size change).

Dear Linda, I am runing SEM using Mplus. If TYPE=MISSING in the ANALYSIS command and STANDARDIZED in the OUTPUT command were used at the same time, the results only provided "Estimates" (no S.E., Est./S.E., Std, StdYX). Any solution? Thanks.